Brake shoe



' June '21, 1927.

V. BEND IX ET AL BRAKE $502;

File'd Dec. 27, 1926 INVENTOR VINCENT BENDIX L ER E. LA BRIE ATTORNEYPatented June 21, 1927.

UNITED STATES PATENT Fries;

VINCENT IBENDIX, OF CHICAGO, ILLINOIS, AND LUDGER E. LA ERIE, 0}? SOUTHBENT),

INDIANA, ASSIGNORS T0 BENDIX BRAKE COMIPANY,

rona'rrouor ILLINOIS.

OF CHICAGO, ILLINOIS, A COR-' BRAKE SHOE.

Application filed December 27, 1926.

This invention relates to brake shoes and is illustrated as embodied inshoes for an internal expanding automobile brake. An object of theinvention is to provide improved constructions for such shoes,especially with a view to increasing their strength and facilitatingtheir manufacture.

Various features of novelty relate to building up the shoe from anarcuate band and a separate web member by forming the web member withinclined tongues secured to the face of the band but with the tongue atthe end of the shoe flat against the face of the band so that the web atthat point is at right angles to the band, to an improvement in thecam-engaging thrust member at the end of the shoe so that it may beembraced between a cam flange and the cam bracket to hold the shoeagainst lateral movement, to stiffening the anchored end of the shoe byintegrally continuing a narrowed part of the band along the pivot arm ofthe shoe, to stiffening a pair of spaced arms on the shoe which areintended to straddle part of an adjacent shoe by integrally continuingan outer band and preferably forming the band to embrace a part of theadjacent shoe to support it against the lateral movement, and to a novelarrangement of bearing Wash ers secured to part of the shoe to embrace apivot for the shoe.

The above and other desirable features of construction will be apparentfrom the following description of the illustrative embodiment shown inthe accompanying drawing, in which:

Figure l is a vertical section through the brake just inside the head ofthe drum, and showing the novel shoes in side elevation;

Figure 2 is a partial section on the line 2-2 of Figure 1 showing thenovel cam plates; I

Figure 3 is a partial section. on the line 3-3 of Figure l and showing asteady rest for one of the shoes;

Figure 4 is a partial elevation of the center shoe, looking in thedirection of the arrows 4% of Figure 1 and showing the arrangement ofthe ab0ve-described tongues;

Figure 5 is a similar elevation at the end of one of the endshoesflooking in the direction of the arrows 5--5 in Figure 1;

Figure 6 is a partial section on the line Serial No. 157,104.

66 of Figure 1 and showing the connection between two of the shoes;

Figure 7 is a section through the center shoe on the line 7--7 of Figure1;

Figure 8 is a section through one of the end. shoes on the line 8-8 ofFigure 1;

Figure 9 is a partial'section on the line 9-9 of Figure Land showing theanchor age of the brake;

Figure 10 is a partial. section on the line 10-1O of Figure 1 andshowing the en:- bra'cingof a part of one shoe by the end of the other;

Figure 11 is a section on the line 11--11 of Figures 1 and 10 andshowing the overlapping of the two shoes; and

Figure 12 is'a section on the line 19rd? 7 of Figure 1 and showing: theconstruction. at the end of the shoe.

The illustrated .bralre includes a rotatable drum 20,- at the open sideof which is arranged stationary support such as a back- 7 ing plate 22,and Within which are arranged three brake shoes 24, 28, and 28. The shoe2-1; is anchored on a pivot 30 between. the ends of the shoe 26, whilethe shoe 26 is anchored on a pivot 32 between the ends of the shoe 24,and the shoe 28 connected to the unanehorcd end of the shoe 26 by afloating pivot 3-1. The brake is applied against the vresistance of areturn spring 3610; means such as a double cam 38, the shoe 25 being 5applied by the shoe 28 against the resistance of an auxiliary returnspring 40. The idle position of the shoe 26 is determined by a stop intheform of a grooved eccentric 42 interlocking with a tiange' l on theend of 9 a floating pivot- 34. The shoe 28 is shown as being providedwith a steady rest including a pin 46 secured to the backing plate 22and projecting through an opening in the shoe E28, and having at its enda. pair of washers 9 48 on opposite sides of the shoe and held a by acotter pin 50. A coil spring 52 is sleeved on the pin to and holds theshoe yieldingly as far outwardly as the cotter pin will permit. Thepresent invention relates to various novel structural features of thebrake shoes, whether or not used in this particular brake.

Each of the brake shoes is built up of n outer arcuate bflfidfii, towhich the ore lining 56 is riveted or otherwise secure and-one or moreseparate stiffening members spot-welded or otherwise secured to the in"nor face of the band. Each of the shoes 24 and 28 has a singlestiffening member 58 radiall slotted to form inclined tongues 60 whicharelaterall bent in opposite directions so that, in" e ect, -as shown inFigure 5, they form two staggered series of tongues 'enga g andspot-welded or otherwise sel0 cure to the inner fac'e of the outer band54. At the ends of the shoes, however, the member 58 extendsperpendicularly against the inner face of the band 54, and is thenturned at right angles to form a separate tongue 62 engaging the innerface of the band 54. Thus the band 54 is supported at its center at theend of the shoe. Shoe 26 is provided with two stiifening members 64 and66 which are formed with alternately bent or staggered tongues '68correspondingycto the tongues 60. As best shown in Figure 4, thecorresponding tongues 68 on the two stiifening members 64 and 66 arepreferably bent in the same a 25 direction throughout the greater part'of the shoe. However, the two end tongues 70 are-both bent outwardly atright angles the same as the tongue 62, so that the ends of thestifi'ening members 64 and 66 are peri pendicular to the inner face ofthe band 54 of shoe'26: I Y The up er ends of the shoes 24 and 28 q areprovided with cam or thrust plates 72 extending across and centrallybraced by the ends of the stiffening members 58. Each cam plate thenextends back to form two parallelparts and is finally extended intoengagement with and secured to the opposite sides of the member 58, sothat each cam plate 72 in efiect formsa box-section adapted to beembraced between the bracket 74, in which the cam-shaft is jour'nalled,and a flange 7 6 on the end of the cam 38.. The ends of the shoes, wherethey are mounted on the] ivots 30, 32, and 34, are preferably providewith hearing washers 78 which are drawn outwardly to form short sleevesadapted to be journalled on the pivots, and which are'notched at theiredges to form sets of radially projecting tongues alternating withnotches or spaces. Where the shoes are provided with these washers onopposite sides,'as for exam Ie the shoe 24 as shown in or opening in thewasher Figure 9, the note on one side is arranged opposite the tongue ofthe washer on the opposite side, so that the tongue may be spot-weldedto the stiffening member 58 with only two thicknesses of metal to bedealt with.

The stifi'ening member 58 of each of the shoes 24 and 28 is continuedbeyond the lower end of the shoeto form an arm adapted to be mounted onthe prefer to stiffen this arm by inte ally continuing a narrowedportion of t e band 54 pivot 30 or 34, and we b substantially to the endof the shoe. This part of thestitlening member 58 pro ec ts at rightangles to the member 54, as shown in Figure 11,vand is formed with aflange 80 spot-Welded or otherwisesecured to the in nor i'ace oitlienarrowed continuation of the band 54. It Will be seen that both of theshoes 24 and 28 project pastthe corresponding ends of the shoe 26, thepivot arms at the lower ends of these shoes being straddled by the endsof the stiffening members (it and (51.3. The shoe 26 is also reinforcedby continuing the band 54 along the pivot arms formed by continuing themembers64 and 66 at the right end of the shoe and offsetting them withinthe curve of the shoe to be mounted on the pivot or anchor We prefer,however, to form an opening 82 betwebn these continuations of the band54, for the lower end of the shoe 24, and at the extreme end of the band54 ofshoe 26 we provide a pair of lugs 84 projecting from opposite sidesof the opening 82 into engagement with the opposite sides of the member58 to position the shoe 24 laterally and sup port it against lateralmovement.

lVhile one illustrative embodiment of the invention has been describedindet-ail, it is not our intention to limit its scope to that particularembodiment or otherwise than by i the terms of the appended claims.

We claim:

1. A brake shoe built up of an arcuate lining-carryin band and a webmember secured to one iace of the band and serving to stiifenit, and inwhich said web member is throughout a considerable part of its lengthformed; with inclinedtongues engag- I ing and secured to said face ofthe band, and

at its end extends substantially perpendicLp V lar to the band with atongue at right angles to said end engaging and secured to said face ofthe band.- i

2. A brake shoebuilt up of an arcuate' lining-carrying band and a webmember secured to one face of the band and serving to stiffen it, and inwhich said web mem her is throughout'a considerable part of its lengthformed with inclined ton ues engagmg and secured to said face 0? theband, and at its end extends substantially perpendicular to the band. 4

3. A brake shoe built up of an arcuate 1min -carrying band and a webmember socure to one face of the band and serving to stifi'en it, and inwhich said web member is throu bout a considerable art of its lengthormed with staggered series of tongues inclined in op site directionsinto enga ement with one ace of the band, and 125 111, w ich said webmember at its end ex tendis perpendicularly from said face of the -4. Abrake shoe havin a stiffening web, and a thrust member at t lie end ofthe shoe I? hold'the shoe against lateral movement.

eitendingacross and centrally engaged by the end of said web, thenextending at hot sides of the shoe in parallel planes parallel to saidweb away from the end of the shoe,

and finally extended into en agement with.

and-secured to the opposite si es of said web, thus formin a box'sectionthrust member "with paralle sides adapted to be embraced tween a camflange and a cam bracket to 5. A brake shoe comprising an outer arcuate.lining-carrylng band, and a curved stlfiemng web member secured alon its"outer edge to the inner face of the ban and at one end of the shoecontinued as a pivot arm offset substantially within the curve of saidband, the band being narrowed in width and into rally continued alongsaid offset arm to stiffen it.

6. A brake shoe comprising an outer arcuate band and a pair .of separates aced stiflenin webs secured to-one face 0 said band an integrallycontinued at one end of the shoe as spaced mwardly-ofiset pivot armsadapted to strddle a part of an adjacent "shoe, the ban being integrallycontinued along said spaced arms an slotted to embrace said part of theadjacent shoe and support it laterall 7. A brake shoe comprising anouter arouate band and a pair of spaced stiffenin webs projecting fromone face of said ban at least at one endyof the shoe; and integraL 1ycontinued at said end of the shoe as 'Zpaced inwardly-offset ivot armsadapted to raddle a part of an a jacent shoe, the band being integrallycontinued along said spaced arms and slotted to embrace said part of theadjacent shoe and'support it laterally.

8. A brake shoe comprising an outer arev nate band and a pair of spacedstiffening webs projecting from one face of said band at least at oneend of the shoe and integrally continued at said end of the shoe asspaced mwardly-ofl'set pivot arms adapted to straddle a part of anadjacent shoe, the band being integ ally continued alon saidspace'd armsan "formedbetween said arms, with a relatively wide opening for thepassage of said part of the adjacent shoe and with. lugs projectingtoward each other from the sidesof said opening near the end of the shoeto engage and support the opposite sides oi said part.

9. A brake shoe comprisingan outer arcuate lining-carrying band and twospaced stiffening members secured to one face of said band and havingalternatel -bent tongues engaging and secured to sai face, thecorresponding tongues of said two members bein bent in the samedirection.

10. A rake shoe having a part formed with anvopenmg, and a' pair ofbearing part in line with said opening, the washers havingoutwardly-extending tongues separated by openings and being arrangedwith the tongues ofone opposite the openings of the other.

In testimony whereof, we have hereunto signed our names. VINCENT BENDIX.

LUDGER E. LA BRIE.

